Tex. Occ. Code § 254.018
A member of the board may not express an oral or written opinion or serve as an expert witness in a civil action that is:
Added by Acts 2007, 80th Leg., R.S., Ch. 1119 (H.B. 3876), Sec. 3, eff. September 1, 2007.
Acts 2013, 83rd Leg., R.S., Ch. 709 (H.B. 3201), Sec. 3, eff. January 1, 2014.